Malicious PDF — malware analysis report

Static analysis result for SHA-256 0538a0991ee59c04…

MALICIOUS

PDF

40.1 KB Created: 2020-08-10 11:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27052340b562f17a3bb9c24040581003 SHA-1: 7ef64055f4e1381cb85e4f604609d9590428a42d SHA-256: 0538a0991ee59c041f8d3e935720abd4e2f58e74ddac3f4e1efe97069e9d0ec4
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, while heavily obfuscated, contains text suggesting a PDF download lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be tricking the user into clicking a link that leads to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=bise+sahiwal+gazette+2020+pdf+download
    • http://files.berryheavenusa.com/uploads/1/3/1/3/131380456/6140884.pdf
    • http://files.thenorthbowlrefinery.com/uploads/1/3/1/4/131406799/4074912.pdf
    • http://tewaw.ludicrousones.com/uploads/1/3/2/8/132816202/zedisin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/fodikatofupaxolu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5494/files/betrayal_aleatha_romig.pdf
    • https://cdn.shopify.com/s/files/1/0427/9857/9879/files/95343749515.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/fowukagidujujuja.pdf
    • https://cdn.shopify.com/s/files/1/0435/2324/4191/files/aircraft_accident_investigation_procedures.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/63964366400.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sobobubujuwin.pdf
    • https://cdn.shopify.com/s/files/1/0434/3575/3639/files/air_pollution_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0443/1269/0844/files/abandono_escolar_no_brasil.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/fotefarufaxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/19557252965.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/lofamukupajobopasepofore.pdf
    • https://cdn.shopify.com/s/files/1/0451/3228/4057/files/hernia_inguinal_estrangulada.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005de7.bin
6912931832f4e705bd55b729b3bb7faa82aff69cc9bee2bd8f96efeb530b7f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE7 5672 bytes
font_01_sfnt_off00007160.bin
5a75a319cac9cd18c57d0c3182fb9db0c8770c919f2a629d9e11a7fe8482d613		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7160 10012 bytes

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